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K & N Custom Air Filter Assembly - RK-3929

  • Part #: 183725
  • Manufacturer Part #: RK-3929

MSRP Price: $476.99

Our Price: $317.88

You Save:
$159.11 (33%)
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Overview of K & N Custom Air Filter Assembly - RK-3929

  • Large-capacity design; 2 3/8 in. tall compared to the standard 1 3/4 in found on the original Twin Cam Filter Kit, DK part no. 304747
  • Boosts performance, service intervals and filtration
  • Designed for Big Inch Performance Motors that require more air
  • Features a K&N High-Flow air filter, a powder-coated billet aluminum backplate that eliminates external breathers, a built-in, dyno-tuned velocity stack
  • Maintains factory appearance, utilizes stock air cleaner outer cover
  • Filter is pre-oiled


  • Included Items:
    (1) Filter Element
    (1) Back Plate
    (1) Spacer Cushion Assy. LH
    (1) Spacer Cushion Assy. RH
    (1) Velocity Stack
    (2) Breather Bolt Extension
    (3) Screws
    (8) Bolts
    (4) Spacers
    (4) Washers
    (1) Grommet
    (1) Vent
    (1) Loctite

    Note:
    Chrome air filter cover is not included, use stock cover

The Air Resources Board (ARB) does not permit the use of aftermarket emission-related parts that alter the air/fuel ratio of an emission-controlled vehicle. Due to these legal restrictions this part cannot be shipped to California.

Specs for K & N Custom Air Filter Assembly - RK-3929

Color - Primary Black
Type Air Cleaner
Units Each
Weight 4.15 lbs

Specs for K & N Custom Air Filter Assembly - RK-3929

Color - Primary Black
Type Air Cleaner
Units Each
Weight 4.15 lbs

Fitment for K & N Custom Air Filter Assembly - RK-3929

See if this part fits your ride

Part 183725 fits the following machines

Harley-Davidson
  • 2006 Harley-Davidson Sportster - XL 883
  • 2005 Harley-Davidson Sportster - XL 883
  • 2004 Harley-Davidson Sportster - XL 883
  • 2006 Harley-Davidson Sportster - XL 883R
  • 2005 Harley-Davidson Sportster - XL 883R
  • 2008 Harley-Davidson Sportster (EFI) - XL 883
  • 2007 Harley-Davidson Sportster (EFI) - XL 883
  • 2007 Harley-Davidson Sportster (EFI) - XL 883R
  • 2016 Harley-Davidson Sportster Custom - XL 1200C
  • 2015 Harley-Davidson Sportster Custom - XL 1200C
  • 2014 Harley-Davidson Sportster Custom - XL 1200C
  • 2013 Harley-Davidson Sportster Custom - XL 1200C
  • 2012 Harley-Davidson Sportster Custom - XL 1200C
  • 2011 Harley-Davidson Sportster Custom - XL 1200C
  • 2010 Harley-Davidson Sportster Custom - XL 1200C
  • 2009 Harley-Davidson Sportster Custom - XL 1200C
  • 2006 Harley-Davidson Sportster Custom - XL 1200C
  • 2005 Harley-Davidson Sportster Custom - XL 1200C
  • 2004 Harley-Davidson Sportster Custom - XL 1200C
  • 2009 Harley-Davidson Sportster Custom - XL 883C
  • 2006 Harley-Davidson Sportster Custom - XL 883C
  • 2005 Harley-Davidson Sportster Custom - XL 883C
  • 2004 Harley-Davidson Sportster Custom - XL 883C
  • 2008 Harley-Davidson Sportster Custom (EFI) - XL 1200C
  • 2007 Harley-Davidson Sportster Custom (EFI) - XL 1200C
  • 2008 Harley-Davidson Sportster Custom (EFI) - XL 883C
  • 2007 Harley-Davidson Sportster Custom (EFI) - XL 883C
  • 2016 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2015 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2014 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2013 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2012 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2011 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2010 Harley-Davidson Sportster Forty-Eight - XL 1200X
  • 2016 Harley-Davidson Sportster Iron - XL 883N
  • 2015 Harley-Davidson Sportster Iron - XL 883N
  • 2014 Harley-Davidson Sportster Iron - XL 883N
  • 2013 Harley-Davidson Sportster Iron - XL 883N
  • 2012 Harley-Davidson Sportster Iron - XL 883N
  • 2011 Harley-Davidson Sportster Iron - XL 883N
  • 2010 Harley-Davidson Sportster Iron - XL 883N
  • 2009 Harley-Davidson Sportster Iron - XL 883N
  • 2011 Harley-Davidson Sportster Low - XL 1200L
  • 2010 Harley-Davidson Sportster Low - XL 1200L
  • 2009 Harley-Davidson Sportster Low - XL 1200L
  • 2006 Harley-Davidson Sportster Low - XL 1200L
  • 2010 Harley-Davidson Sportster Low - XL 883L
  • 2009 Harley-Davidson Sportster Low - XL 883L
  • 2006 Harley-Davidson Sportster Low - XL 883L
  • 2005 Harley-Davidson Sportster Low - XL 883L
  • 2008 Harley-Davidson Sportster Low (EFI) - XL 1200L
  • 2007 Harley-Davidson Sportster Low (EFI) - XL 1200L
  • 2008 Harley-Davidson Sportster Low (EFI) - XL 883L
  • 2007 Harley-Davidson Sportster Low (EFI) - XL 883L
  • 2012 Harley-Davidson Sportster Nightster - XL 1200N
  • 2011 Harley-Davidson Sportster Nightster - XL 1200N
  • 2010 Harley-Davidson Sportster Nightster - XL 1200N
  • 2009 Harley-Davidson Sportster Nightster - XL 1200N
  • 2008 Harley-Davidson Sportster Nightster (EFI) - XL 1200N
  • 2007 Harley-Davidson Sportster Nightster (EFI) - XL 1200N
  • 2006 Harley-Davidson Sportster Roadster - XL 1200R
  • 2005 Harley-Davidson Sportster Roadster - XL 1200R
  • 2004 Harley-Davidson Sportster Roadster - XL 1200R
  • 2008 Harley-Davidson Sportster Roadster (EFI) - XL 1200R
  • 2007 Harley-Davidson Sportster Roadster (EFI) - XL 1200R
  • 2016 Harley-Davidson Sportster Seventy Two - XL 1200V
  • 2015 Harley-Davidson Sportster Seventy Two - XL 1200V
  • 2014 Harley-Davidson Sportster Seventy Two - XL 1200V
  • 2013 Harley-Davidson Sportster Seventy Two - XL 1200V
  • 2012 Harley-Davidson Sportster Seventy Two - XL 1200V
  • 2016 Harley-Davidson Sportster Superlow - XL 1200T
  • 2015 Harley-Davidson Sportster Superlow - XL 1200T
  • 2014 Harley-Davidson Sportster Superlow - XL 1200T
  • 2016 Harley-Davidson Sportster Superlow - XL 883L
  • 2015 Harley-Davidson Sportster Superlow - XL 883L
  • 2014 Harley-Davidson Sportster Superlow - XL 883L
  • 2013 Harley-Davidson Sportster Superlow - XL 883L
  • 2012 Harley-Davidson Sportster Superlow - XL 883L
  • 2011 Harley-Davidson Sportster Superlow - XL 883L

Filter Kits - RK3909

5 out of 8 reviews
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K&N

Great filter! install was cake, and I love that it keeps the stock cover. would get it again if need be. only thing is READ all the instructions before you even start. great service from dennis kirk as always.

Review By:

from Jersey

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Can feel power differance

Very fast shipping from Dennis Kirk and great prices, Went with the K and N name and reputation, was not dissapointed, very easy install and stock air dleaner cover fits to look stock, Can feel the differance even before new pipes were installed.

Review By:

from Central Il.

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Twin Cam Filter Kit

Pretty easy install, even for a noob like me. Don't forget to check the little flat box under all the items. The backplane is in their and I almost missed it! 8)

Review By:

from Crestview, FL

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K&N quality and performance! GREAT!

I have been a dedicated K&N customer since at least 1996, and this product does not disappoint! You get an awesome quality product here, and the reason I bought this was it uses your stock air cleaner cover for a factory look but pulls in MUCH more air. The assembly directions could be a little more clear in the correct location/orientation of the "Spacer" nuts, just make sue you read carefully. Also Do NOT forget to put some BLUE thread-locker on the air cleaner cover bolt (I didn't do this and after about 280 miles it vibrated loose and I ALMOST lost my air cleaner cover).

Review By:

from Central Oklahoma

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Nice Product

I went back and forth between this product and the Big Sucker. Decided to go with the K&N because of the company's history for making a quality product. Install was fast and very easy, instructions were detailed and veru idiot proof. Performance increase is significant. Installed this with a set of Vance and Hines Big Shots and a V & H FuekPak. Runs very nice.

Review By:

from Joplin, MO

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SIMPLE INSTALL /BEST K&N ASSY YET!

First off got quite a deal through Dennis Kirk using there price match on top of that there shipping time was outstanding (as usuall) Back to the K&N 3930, install was a breeze, about 1/2 hour but it probably would of been less if I had not to dig up the tools. I feel that there 3930 is a vast improvement over the earlier HD style Stage 1 air cleaner kits using the round filtyer. This by far is the simplest to install.

Review By:

from Chicago, IL

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Instructions and Manuals for K & N Custom Air Filter Assembly - RK-3929

Owner's Manual Owner's Manual PDF 134.4 KiB

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